Though such inefficiencies are unfortunate, and discouraging, I think they only slow progress. I think evenutally an article on Hemovidin will be written and not deleted, and I wouldn't be surprised if most encyclopedias don't even have such an entry.
There is some clunkiness around wikipedia, but compared to academia (which almost everybody without journal access and fluency in english is restricted from reading) it's by far superior. In fact, I can't think of another better source of reliable information that is freely and widely accessible.